What is the meaning of Gurges?

A whirlpool.

A series of typically four to six concentric annulets (in early heraldry, from at least the 1200s), or a spiralling line from the centre to the edge of the shield (in late heraldry); a stylized whirlpool.

plural of gurge

whirlpool

eddy

gulf, sea

abyss

Source: wiktionary.org